<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		<style type="text/css">
			/*标签选择器*/
			/*div{
				color: red;
			}
			h1{
				color: green;
			}*/
			/*类名选择器 (.  +  类名)*/
			.zs{
				color: red;
			}
			.fxb{
				color: green;
				font-size: 30px;
			}
		</style>
	</head>
	<body>
		<!--class：添加类名-->
		<div class="zs">zs</div>
		<div class="fxb">fxb</div>
	</body>
</html>